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Waqas Hassan Tanveer,지상훈,유원종,차석원 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Electrolyte thin films of yttria-stabilized- zirconia (YSZ) for low temperature solid oxide fuel cell applications are investigated. Films of same thickness and composition are fabricated by using two distinct thin film deposition techniques, atomic layer deposition (ALD) and radio frequency (RF) sputtering. Scanning electron microscopic images indicate that both methods form uniform, polycrystalline films on amorphous matrix. Deposition rates of ALD and sputtered YSZ electrolyte films are easily controllable. In-plane ionic conductivity of O2- ions for YSZ is measured using electrochemical impedance spectroscopy. Experimental results show that, at a low temperature of 250°C, ALD YSZ thin films exhibit considerably lower resistance to the conduction of oxygen ions as compared to the sputtered films. This lower resistance results in better ionic conductivity of ALD YSZ thin films.
Waqas Hassan Tanveer,Sang-Hoon Ji,유원종,Gu Young Cho,이윤호,박태현,Yaegeun Lee,Yusung Kim,Suk Won Cha 한국물리학회 2016 Current Applied Physics Vol.16 No.12
We prepared nickel-samaria-doped-ceria cermet anodes for intermediate temperature solid oxide fuel cells, by using two different background sputtering gases. One is a reactive mixture gas of pure argon and oxygen (Ar/O2:80/20), and other is non-reactive pure argon gas. For all cells, a 150 mm fully stabilized scandia-stabilized-zirconia pellet was used as an electrolyte support. Lanthanum strontium manganite ink was screen-printed on the electrolyte support to act as a cathode. Initial results showed that the anodes produced by non-reactive background sputtering gas, outperformed the anodes produced by reactive mixture background gas in all categories of performance and also showed lesser agglomeration with time.
Real-Time Occlusion Tolerant Detection of Illegally Parked Vehicles
Waqas Hassan,Philip Birch,Rupert Young,Chris Chatwin 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.5
Illegally parked vehicle detection systems are considered crucial elements in the development of any video-surveillance based traffic-management system. The major challenges in this task lie in making the end solution real time, illumination invariant and occlusion tolerant. A two-stage application framework is presented which efficiently identifies vehicles parked illegally in restricted parking-zones. A real-time approach has been followed and an improved foreground segmentation method based on Segmentation History Images (SHI) is developed to identify stationary objects. A three step pixel based classification method is applied on the background segmentation output to segment adjacent moving pixels that become stationary for certain periods of time. The process then locks on to all identified stationary pixel patches, parts of which overlap with the regions of interest marked interac-tively a priori. The second stage of the process is applied subsequently to track all the stationary pixel patches detected during the first stage using an adaptive edge orientation based tracking method. Experimental results show that the tracking technique gives more than a 90% detection success rate, even if objects are partially occluded. The technique has been tested on the UK Home Office i-LIDS Parked Vehicle video sequences along with the University of Sussex Traffic Dataset and results are compared with other available state of the art methods.
Tanveer, Waqas Hassan,Ji, Sanghoon,Yu, Wonjong,Cho, Gu Young,Lee, Yoon Ho,Cha, Suk Won American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.11
<P> We investigated the effects of the insertion of a gadolinium-doped ceria (GDC) anodic functional layer (AFL) on the electrochemical performance of intermediate-temperature solid-oxide fuel cells (SOFCs). Fully stabilized yttria-stabilized zirconia (YSZ) was used as an oxygen-ion-conducting and support material. Nickel-Samaria-doped ceriathin film was used as an anode material, while screen-printed lanthanum strontium magnetite served as a cathode material. In order to enhance the interfacial reaction on the anode side, a GDC-AFL with a thickness of about 140 nm, deposited via radio-frequency sputtering, was inserted into the anode-electrolyte interface. SOFCs with and without a GDC-AFL were electrochemically characterized. In an intermediate temperature range of about 700 ∼ 800 °C, the application of the GDC-AFL led to an increase in the peak power density of approximately 16%. </P>
Tanveer, Waqas Hassan,Ji, Sanghoon,Yu, Wonjong,Cha, Suk Won Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.10
Electrolyte thin films of yttria-stabilized- zirconia (YSZ) for low temperature solid oxide fuel cell applications are investigated. Films of same thickness and composition are fabricated by using two distinct thin film deposition techniques, atomic layer deposition (ALD) and radio frequency (RF) sputtering. Scanning electron microscopic images indicate that both methods form uniform, polycrystalline films on amorphous matrix. Deposition rates of ALD and sputtered YSZ electrolyte films are easily controllable. In-plane ionic conductivity of <TEX>$O^{2-}$</TEX> ions for YSZ is measured using electrochemical impedance spectroscopy. Experimental results show that, at a low temperature of <TEX>$250^{\circ}C$</TEX>, ALD YSZ thin films exhibit considerably lower resistance to the conduction of oxygen ions as compared to the sputtered films. This lower resistance results in better ionic conductivity of ALD YSZ thin films.
Tanveer, Waqas Hassan,Ji, Sanghoon,Yu, Wonjong,Cho, Gu Young,Lee, Yoon Ho,Park, Taehyun,Lee, Yeageun,Kim, Yusung,Cha, Suk Won Elsevier 2016 Current Applied Physics Vol.16 No.12
<P>We prepared nickel-samaria-doped-ceria cermet anodes for intermediate temperature solid oxide fuel cells, by using two different background sputtering gases. One is a reactive mixture gas of pure argon and oxygen (Ar/O2:80/20), and other is non-reactive pure argon gas. For all cells, a 150 mu m fully stabilized scandia-stabilized-zirconia pellet was used as an electrolyte support. Lanthanum strontium manganite ink was screen-printed on the electrolyte support to act as a cathode. Initial results showed that the anodes produced by non-reactive background sputtering gas, outperformed the anodes produced by reactive mixture background gas in all categories of performance and also showed lesser agglomeration with time. (C) 2016 Elsevier B. V. All rights reserved.</P>